Coil supporting spider



May 9, 1933. P. H. A. VAN LIS' COIL SUPPORTING SPIDER Filed Aug. 5, 1930I INVENTOR PETER HENDRIX ABRAHAM VAN US BY m ATTORNEY Patented May 9,1933 NITED STATES NT-1 "'YQFF Ic j PIETER HENDRIK ABRAHAM VAN LIS, ormnnnovnmfirnrnnnmnns, Assrenon ro RADIO ooaronnrron or AnemoneCORPORATION or fnmwmn H COIL SUPPORTIN srrinzin.

Application filed August 5, 1930, Serial No. 473,265, andin'theNetherlands September a, 1929;

9- to the'body are transmitted to the coil. The

This invention has reference to a supporting and centering body for thecoil of an electro-dynamic device for converting electric oscillationsinto acoustic or conversely such, for example, as electro dynamicloudspeakers, microphones, pick-ups or the like.

According to the invention the body is made of insulating material andthe electric connection between the coil and the point of connection forthe speech currents consists of metal conductors which pass through orare mounted on the material of the said body.

If the body is made of the substance known under the registeredtrademark Bakelite and if the connection consists, for example, ofconductive wires they can be readily pressed into the Bakelite duringthe manufacture of the body.

It is thus possible for the body with the connecting wires to be pressedinto the desired shape at one manipulation so that the product isparticularly adapted to be manu factured in bulk.

In a diflerent embodiment of the invention the electric connection isestablished by locally squirting the body with metal in a pulverizedstate.

In order that the invention may be clearly understood and readilycarried into effect it will be described more fully with reference tothe accompanying drawing in which Figure l is a plan of one form ofconstruction of a supporting and centering body according to theinvention, and

Figure 2 is a plan of a different form of construction of such a body.

Referring to Figure 1, l designates the supporting and centering body,for example of Bakelite, for the coil 2 of an electrodynamic loudspeakersaid coil being movably arranged in a magnetic field. The windings ofthe coil are arranged on a small cylinder 3 integral with the body. Theends of the arms 4 have mounted in them copper rings 5 by means of whichthe body is secured to the magnet system (not shown). At least two ofthepoints of attachment serve as points of connection to the conductors6 and 7 by means of which the speech currents which are led through theconductors 8 and conductors 6 and 7, which may consist, for example, ofcopper. wire, are .pressed into the Bakelite during the manufacture ofthe body, said manufacture and the pressing operation being efiected atone manipulation. In order that it may stand out clearly that the wiresare imbedded in the bakelite they are designated by dotted lines.

In the embodiment of the invention shown in Figure 2 the electricconnection between the coil 2 and the points of attachment 5 isestablished by squirting two of the arms 4 with metal in a pulverizedstate, as is shown inthe figure by hatching for the sake of clearness. V

What I claim is: V

1. A supporting and centering body for I the coil of an electro dynamicacoustic device, comprising a central portion adapted to have sald coilsecured thereto, a plurality of flexible non-conducting elementsextending outwardly from said central portion, andmeans for supplyingspeech currents to said coil,

said means conslsting oflayers of conducting material deposited upon atleast two ofsaid flexible elements.

2. A supporting and centering body for the diaphragm and driving coil ofan electro dynamic acoustic device comprising an ,annular centralportion adapted to have said coil secured thereto, and a plurality offlexible non-conducting portions extending substantially radiallytherefrom, at least two of said vice, comprising a'relatively rigidportion adapted to have said coil secured thereto, a plurality offlexible non-conducting elements extending outwardly from said rigidportion,

flexible portions having metallic conductors 11.

and means for supplying speech currents to said coil, said meansconsisting of layers of deposited metal carried by at least two of saidflexible elements.

4. A supporting member for the voice coil of an electro-dynamic acousticdevice comprising a portion adapted to be secured to the voice coil .orthe voice coil supporting member, a plurality of flexible arms extendingoutwardly from said portion, and conductors pressed into and carried byat least one of said arms.

5. A supporting member for the voice coil of an electrodynamic acousticdevice comprising a portion adapted tobe secured to the voice coil. orthe voice coil supporting member, a plurality of flexible arms extendingfrom said 1 portion, an unbroken layer of metallic material deposited onone'side ofone; of said arms, and a second unbroken layer of metallic;material deposited. on one side of another of said arms, said layers ofmetallic material constituting the leads for said voice coil. 7 1

" PIETER HENDRIK"ABRAHAM vanllS.

